EntropyThese processes are shown in reverse. The situations shown are so highly improbable that we would not expect to observe them in nature.

Thermodynamics

Endothermic ReactionSolid barium hydroxide octahydrate (Ba(OH)2*8H2O) and ammonium thiocyanate (NH4SCN) are mixed in a beaker, which is then placed on a few drops of water on a small board. The reaction that occurs is highly endothermic.

Thermodynamics : GibbsFromHSandT (5 Variations)
On the space shuttle, the carbon dioxide produced by the astronauts is handled by an environmental control system that utilizes the following reaction.H° = -138.4 kJ and S° = -139 J/K
Calculate G° at 25°C for this reaction.